US20230049457A1 - Battery cell, battery, and electric apparatus - Google Patents

Battery cell, battery, and electric apparatus Download PDF

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Publication number
US20230049457A1
US20230049457A1 US17/973,741 US202217973741A US2023049457A1 US 20230049457 A1 US20230049457 A1 US 20230049457A1 US 202217973741 A US202217973741 A US 202217973741A US 2023049457 A1 US2023049457 A1 US 2023049457A1
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United States
Prior art keywords
adapter
bending portion
bending
tab
electrode terminal
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Pending
Application number
US17/973,741
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English (en)
Inventor
Kun Fang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED reassignment CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FANG, Kun
Publication of US20230049457A1 publication Critical patent/US20230049457A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • This application relates to the field of battery technologies, and in particular, to a battery cell, a battery, and an electric apparatus.
  • rechargeable batteries are required to have a longer battery life.
  • a key factor that determines battery life is energy density of batteries, which is generally increased by increasing the volume of electrode assemblies. A larger volume of the electrode assemblies leads to a larger volume of the rechargeable batteries.
  • the space for batteries in the electric vehicles is generally limited, making it difficult to assemble battery groups in such limited space.
  • This application provides a battery cell, a battery, and an electric apparatus, to increase energy density of the battery.
  • this application provides a battery cell, including: an electrode assembly, including a first tab and a second tab, where the first tab and the second tab are respectively located on two ends of the electrode assembly in a first direction; a first electrode terminal and a second electrode terminal, where the first electrode terminal and the second electrode terminal are respectively located on two sides of the electrode assembly in the first direction; a first adapter, configured to connect the first tab and the first electrode terminal; and a second adapter, configured to connect the second tab and the second electrode terminal, where the first adapter and the second adapter each include at least two non-bending portions and a bending portion that connects two adjacent ones of the non-bending portions; and the number of the non-bending portions of the second adapter is greater than the number of the non-bending portions of the first adapter.
  • the battery cell includes the first adapter and the second adapter, where the first adapter and the second adapter each include at least two non-bending portions and a bending portion that connects two adjacent ones of the non-bending portions.
  • the first adapter and the second adapter are both of a stacking structure, occupying small space and increasing space utilization of the battery cell. Compared with the number of the non-bending portions of the second adapter, the number of the non-bending portions of the first adapter is reduced, equivalent to reducing bending times of the first adapter and reducing space usage of the first adapter, which can further increase space utilization of the battery cell, increase energy density of the battery, and prolong battery life.
  • the at least two non-bending portions of the first adapter include a first non-bending portion and a second non-bending portion, where the first non-bending portion is connected to the first electrode terminal, and the second non-bending portion is connected to the first tab; and the at least two non-bending portions of the second adapter include a third non-bending portion, a fourth non-bending portion, and a fifth non-bending portion, where the third non-bending portion is connected to the second electrode terminal, the fourth non-bending portion is connected to the second tab, and the fifth non-bending portion is provided between the third non-bending portion and the fourth non-bending portion.
  • the first electrode terminal and the first tab do not need to be welded to the entire first adapter, greatly reducing the welding difficulty.
  • resistivity of the second adapter is smaller than that of the first adapter. A resistance difference between the first adapter and the second adapter is reduced, so that heat produced by the first adapter is close to that produced by the second adapter, thereby improving consistency of the battery cell.
  • the first adapter is made of aluminum, and the second adapter is made of copper.
  • length of the second adapter is greater than that of the first adapter, achieving more balanced heat distribution for the first adapter and the second adapter.
  • minimum thickness of the bending portion is smaller than that of the non-bending portion.
  • the first adapter and the second adapter are easier to bend, allowing them to be placed into the housing more easily.
  • a gap at a bending position of the stacked first adapter formed by bending and the second adapter is smaller, increasing space utilization of the battery cell.
  • the bending portion includes a transition section, the transition section is connected to the non-bending portion, and thickness of the transition section decreases in a direction leaving the non-banding portion connected to the transition section. Stress applied to a joint between the bending portion and its connected non-bending portion can be reduced to reduce possibility of fracture of the first adapter and the second adapter.
  • the first electrode terminal runs through and is connected to the non-bending portion of the first adapter.
  • a position at which the first electrode terminal is welded to the first adapter can be accurately determined to enhance welding yield.
  • the first electrode terminal includes a first terminal body, a first platform portion and a first protruding portion that are separately connected to the first terminal body, the first protruding portion runs through and is connected to the non-bending portion of the first adapter, and the first platform portion abuts against a side of the non-bending portion of the first adapter facing away from the first tab.
  • the first platform portion is configured to limit the displacement of the first protruding portion in a first direction, preventing the first electrode terminal from slipping out of the first adapter before welding.
  • this application further provides a battery, including the battery cell according to the foregoing embodiments.
  • Battery life can be prolonged by increasing energy density of the battery cell.
  • this application provides an electric apparatus, including the battery cell or the battery according to the foregoing embodiments.
  • the battery cell or the battery is configured to supply electrical energy. Duration performance of the electric apparatus can be improved by increasing energy density of the battery cell.
  • FIG. 1 A is a schematic structural diagram of a vehicle disclosed in an embodiment of this application.
  • FIG. 1 B is a schematic structural diagram of a battery disclosed in an embodiment of this application.
  • FIG. 2 is a schematic structural diagram of a battery module disclosed in an embodiment of this application.
  • FIG. 3 is a schematic structural exploded view of a battery module disclosed in an embodiment of this application.
  • FIG. 4 is a schematic structural exploded view of a battery cell disclosed in an embodiment of this application.
  • FIG. 5 is a vertical view of FIG. 4 ;
  • FIG. 6 is a schematic cross-sectional view of a structure along the A-A direction in FIG. 5 ;
  • FIG. 7 is an exploded view of a second end cover assembly
  • FIG. 8 is an exploded view of a second end cover assembly
  • FIG. 9 is a schematic structural diagram of a second adapter in a non-bending state
  • FIG. 10 is a schematic structural diagram of a second adapter in a non-bending state
  • FIG. 11 is an enlarged view of Part I in FIG. 10 ;
  • FIG. 12 is an exploded view of a first end cover assembly
  • FIG. 13 is a schematic structural diagram of a first adapter in a non-bending state
  • FIG. 14 is a schematic cross-sectional view of a structure along the C-C direction of a first adapter.
  • FIG. 15 is a processing diagram of a battery cell.
  • second protruding portion 90 . first adapter; 91 . first non-bending portion; 92 . second non-bending portion; 100 . second adapter; 110 . third non-bending portion; 111 . first through hole; 120 . fifth non-bending portion; 121 . second through hole; 140 . fourth non-bending portion; 130 . bending portion; 131 . transition section; and 132 . middle section.
  • a plurality of means two or more; and the orientations or positional relationships indicated by the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, and the like are merely intended to help the description of this application and simplify the description rather than indicate or imply that the apparatuses or components must have specific orientations, or be constructed and manipulated according to specific orientations. Therefore, these terms shall not be construed as limitations on this application.
  • the terms “first”, “second”, and “third”, and the like are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance. “Vertical” is not strictly vertical, but within an allowable range of error. “Parallel” is not strictly parallel, but within an allowable range of error.
  • battery energy density of an existing battery cell is generally increased by increasing volume of electrode assemblies, but a larger volume of the electrode assemblies will lead to a larger volume of other assemblies associated with the electrode assemblies, such as a housing for accommodating the electrode assemblies.
  • This will increase the overall space occupied by the battery cell, not conducive to assembling of multiple groups of battery cells in a limited space, and will also greatly increase invested costs, not conducive to actual implementation.
  • the applicants have increased space utilization from the perspective of internal space utilization of battery cells, so as to increase energy density of a battery.
  • the applicants have designed the structural type of adapters, and found that a stacked adapter formed by bending occupies less space and that the stacked adapter has a powerful current flow capacity, which can greatly increase space utilization and energy density of the battery.
  • the positive and negative electrode adapters generally adopt a structure with the same number of layers. However, the applicants have found that even if the number of layers of the adapter at one end is reduced, a production requirement can still be met. Therefore, use of the positive and negative electrode adapters with the same number of layers causes a waste of internal space of the battery cell and reduces space utilization.
  • An embodiment of this application provides an electric apparatus using a battery 10 as a power supply.
  • the electric apparatus may be, but is not limited to, a vehicle, a ship, an aircraft, or the like.
  • an embodiment of this application provides a vehicle 1 .
  • the vehicle 1 may be an oil-fueled vehicle, a gas-fueled vehicle, or a new energy vehicle.
  • the new energy vehicle may be a battery electric vehicle, a hybrid electric vehicle, an extended-range electric vehicle, or the like.
  • the vehicle 1 may include a motor 1 a , a controller 1 b , and a battery 10 .
  • the controller 1 b is configured to control the battery 10 to supply power to the motor 1 a .
  • the motor 1 a is connected to wheels through a transmission mechanism to drive the vehicle 1 to move.
  • the battery 10 may be used as a driving power supply of the vehicle 1 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1 .
  • the battery 10 may be disposed at the bottom, the front, or the rear of the vehicle 1 .
  • the battery 10 may be configured to supply electricity to the vehicle 1 .
  • the battery 10 may be used as an operating power supply for the vehicle 1 and applied to a circuit system of the vehicle 1 .
  • the battery 10 may be configured to meet power usage requirements of the vehicle 1 for starting, navigating, and operating.
  • the battery 10 includes a box body.
  • the box body is not limited to a specific type.
  • the box body may be a frame-shaped box body, a disk-shaped box body, a box-shaped box body, or the like.
  • the box body includes a first portion 11 and a second portion 12 that is engaged to the first portion 11 .
  • the second portion 12 is engaged to the first portion 11 to form an accommodating portion.
  • FIG. 2 illustratively shows a battery module 20 according to an embodiment, and the battery module 20 is disposed in the box body.
  • the battery module 20 includes a plurality of battery cells 40 .
  • the battery 10 may include a plurality of battery cells 40 , where the plurality of battery cells 40 may be connected in series, parallel, or series and parallel, and being connected in series and parallel means a combination of series and parallel connections.
  • the plurality of battery cells 40 may be directly disposed in the accommodating portion of the box body to form the battery 10 .
  • the battery module 20 includes a shell 30 and the battery cells 40 disposed in the shell 30 .
  • the shell 30 includes a barrel body 31 , a first cover body 32 , and a second cover body 33 .
  • the first cover body 32 and the second cover body 33 are respectively disposed on two ends of the barrel body 31 .
  • the first cover body 32 and the second cover body 33 may be detachably connected to the barrel body 31 separately.
  • the first cover body 32 and the second cover body 33 are snap-connected to the barrel body 31 or connected to the barrel body 31 by using a screw.
  • the barrel body 31 , the first cover body 32 , and the second cover body 33 are assembled to form an accommodating space.
  • the battery cell 40 is disposed in the accommodating space of the shell 30 .
  • the structure of the shell 30 is not limited to the above-mentioned embodiments.
  • the shall 30 is formed by snapping two open cover-shaped portions, as long as a plurality of battery cell 40 can be assembled.
  • a battery cell 40 in an embodiment of this application includes a housing 50 and an electrode assembly 60 disposed in the housing 50 .
  • the housing 50 in this embodiment of this application is of a cylinder structure or of other structures.
  • the housing 50 is provided with an inner space for accommodating the electrode assembly 60 and an electrolyte and an opening in communication with the inner space.
  • the housing 50 may be made of materials such as aluminum, aluminum alloy, plastic, or the like.
  • the electrode assembly 60 in this embodiment of this application may be formed by stacking or winding a first electrode plate, a second electrode plate, and a separator, where the separator is an insulator sandwiched between the first electrode plate and the second electrode plate.
  • the first electrode plate is a positive electrode plate
  • the second electrode plate is a negative electrode plate.
  • the positive electrode plate and the negative electrode plate each include a coating area and a non-coating area.
  • a coating area of the positive electrode plate is coated with a positive electrode active substance
  • a coating area of the negative electrode plate is coated with a negative electrode active substance.
  • the active substance is applied to a current collector formed by a metal sheet, and no active substance is applied to the non-coating area.
  • the electrode assembly 60 includes a body portion, a first tab 61 , and a second tab 62 .
  • the body portion has two ends arranged opposite each other.
  • the first tab 61 and the second tab 62 are respectively disposed on two ends of the electrode assembly 60 in a first direction.
  • the first direction may be a length direction of the electrode assembly 60 .
  • the first tab 61 is a positive tab
  • the second tab 62 is a negative tab.
  • the non-coating areas of the positive electrode plate are stacked to form the positive tab
  • the non-coating areas of the negative electrode plate are stacked to form the negative tab.
  • the positive tab and the negative tab each extend from an end of the body portion.
  • the battery cell 40 in this embodiment of this application further includes an end cover assembly, where the end cover assembly includes an end cover 70 , an electrode terminal, and an adapter.
  • the end cover 70 is sealedly connected to the housing 50 .
  • the electrode terminal is disposed on the end cover 70 .
  • the electrode terminal is electrically connected to the electrode assembly 60 through the adapter.
  • the adapter guides current for the electrode terminal and the electrode assembly 60 , thereby ensuring normal current conduction of the electrode terminal and the electrode assembly 60 .
  • the end cover 70 , the electrode terminal, and the adapter are all provided in two. Each of two sides of the electrode assembly 60 in the first direction (that is, two opposite sides in the length direction of the electrode assembly 60 ) is correspondingly provided with one end cover assembly.
  • an adapter of the battery cell shown in FIG. 6 is a structure in a bending state
  • an adapter of the second end cover assembly shown in FIG. 7 is a structure in a non-bending state
  • an adapter of the first end cover assembly shown in FIG. 12 is a structure in a non-bending state.
  • the first end cover assembly and the second end cover assembly are respectively provided on two sides of the electrode assembly 60 in the first direction.
  • the first end cover assembly includes an end cover 70 , a first electrode terminal 801 , and a first adapter 90 .
  • the first electrode terminal 801 may be connected to the first tab 61 through the first adapter 90 .
  • the second end cover assembly may include an end cover 70 , a second electrode terminal 802 , and a second adapter 100 .
  • the second electrode terminal 802 may be connected to the second tab 62 through the second adapter 100 .
  • the first adapter 90 and the second adapter 100 each may include at least two non-bending portions and a bending portion 130 connected between every two adjacent non-bending portions, and the number of the non-bending portions of the second adapter 100 is greater than the number of the non-bending portions of the first adapter 90 .
  • Both the first adapter 90 and the second adapter 100 after being put into the housing are of a stacking structure.
  • the stacking structure occupies a small space, which can increase space utilization of the battery cell 40 and further increase energy density of the battery cell 40 .
  • reducing the number of the non-bending portions of the first adapter 90 can reduce bending times of the first adapter 90 , and reduce space usage of the first adapter 90 , thereby further increasing space utilization of the battery cell, increasing energy density of the battery cell 40 , and prolonging battery life.
  • the at least two non-bending portions of the second adapter 100 include a third non-bending portion 110 , a fourth non-bending portion 140 , and a fifth non-bending portion 120 , where the third non-bending portion 110 is connected to the second electrode terminal 802 , the fourth non-bending portion 140 is connected to the second tab 62 , and the fifth non-bending portion 120 is provided between the third non-bending portion 110 and the fourth non-bending portion 140 .
  • the second adapter 100 , the second tab 62 , and the second electrode terminal 802 are generally connected by welding, such as laser welding or ultrasonic welding.
  • the second adapter 100 When the second adapter 100 is being welded to the second tab 62 , only the fourth non-bending portion 140 needs to be welded to the second tab 62 .
  • the second adapter 100 When the second adapter 100 is being welded to the second electrode terminal 802 , only the third non-bending portion 110 needs to be welded to the second electrode terminal 802 .
  • the second electrode terminal 802 and the second tab 62 do not need to be welded to the entire second adapter 100 , greatly reducing the welding difficulty.
  • the second electrode terminal 802 may alternatively run through and be connected to the non-bending portion of the second adapter 100 .
  • the second electrode terminal 802 includes a second terminal body 84 and a second protruding portion 86 , the non-bending portions of the second adapter 100 are all provided with a third through hole, and the second protruding portion 86 is provided in the third through hole, so as to connect the second protruding portion 86 and the second adapter 100 .
  • the second protruding portion 86 fits with the third through hole, which can reduce total height of the second electrode terminal 802 and the second adapter 100 to further increase energy density of the battery cell 40 , and can also accurately locate the welding position to simplify a welding process and facilitate assembling.
  • the second protruding portion 86 may be seam-welded to the second adapter 100 .
  • the second electrode terminal 802 may be directly welded to a side of the non-bending portion of the second adapter 100 , instead of being welded to the entire second adapter 100 , thereby reducing difficulty of welding. How the second electrode terminal 802 is specifically welded to the second adapter 100 is not limited herein.
  • the second electrode terminal 802 may be provided with a second platform portion 85 , where the second platform portion 85 abuts against a side of the non-bending portion of the second adapter 100 facing away from the second tab 62 , and the second platform portion 85 abuts against the third non-bending portion 110 .
  • the non-bending portion connected to the second tab 62 may be provided with a through hole.
  • the fourth non-bending portion of the second adapter 100 may be provided with a second through hole 121 .
  • the at least two non-bending portions of the first adapter 90 may include a first non-bending portion 91 and a second non-bending portion 92 , the first non-bending portion 91 is connected to the first electrode terminal 801 , and the second non-bending portion 92 is connected to the first tab 61 .
  • the first adapter 90 , the first tab 61 , and the first electrode terminal 801 are generally connected by welding, such as laser welding or ultrasonic welding.
  • welding such as laser welding or ultrasonic welding.
  • the first adapter 90 When the first adapter 90 is being welded to the first electrode terminal 801 , only the first non-bending portion 91 needs to be welded to the first electrode terminal 801 .
  • the first electrode terminal 801 and the first tab 61 do not need to be welded to the entire first adapter 90 , greatly reducing the welding difficulty.
  • the first electrode terminal 801 may run through and be connected to the non-bending portion of the first adapter 90 .
  • the first electrode terminal 801 includes a first terminal body 81 and a first protruding portion 83
  • the first non-bending portion 91 of the first adapter 90 is provided with a first through hole 111
  • the first protruding portion 83 is provided in the first through hole 111 , so as to connect the first protruding portion 83 to the first adapter 90 .
  • the first protruding portion 83 fits with the first through hole 111 , which can reduce total height of the first electrode terminal 801 and the first adapter 90 to further improve energy density of the battery cell 40 , and can also determine a welding position accurately to simplify a welding process and facilitate assembling.
  • the first protruding portion 83 may be seam-welded to the first adapter 90 .
  • the first electrode terminal 801 may alternatively be directly welded to a side of the non-bending portion of the first adapter 90 , instead of being welded to the entire first adapter 90 , thereby reducing the welding difficulty. How the first electrode terminal 801 is welded to the first adapter 90 is not specifically limited herein.
  • the first electrode terminal 801 may also be provided with a first platform portion 82 , where the first platform portion 82 abuts against a side of the first non-bending portion 91 of the first adapter 90 facing away from the first tab 61 .
  • the first platform portion 82 abuts against the first non-bending portion 91 to limit a position of the first protruding portion 83 , thereby limiting displacement of the first protruding portion 83 in the first direction and preventing the first electrode terminal 801 from slipping out of the first adapter 90 before welding.
  • the non-bending portion connected to the first tab 61 may be provided with a through hole.
  • the second non-bending portion 92 of the first adapter 90 may be provided with a second through hole 121 .
  • minimum thickness of the bending portion 130 of the adapter may be smaller than that of the non-bending portion. If the bending portion 130 and the non-bending portion are of equal thickness, when the adapter is being bent, the bending portion 130 may protrude in a direction towards the non-bending portion connected to the bending portion 130 , and a height of the bending portion 130 after being bent is greater than that of the non-bending portion connected to the bending portion 130 , causing the stacked adapter to be high and occupy more space.
  • the bending portion 130 in this embodiment has a smaller minimum thickness, so that the adapter can be bent more easily due to smaller bending pressure.
  • the bending portion 130 is bent into an arc, which can reduce the possibility that the bending portion 130 protrudes in a direction towards the non-bending portion connected to the bending portion 130 , and the stacked adapter formed by bending has a smaller gap at a bending position, thereby reducing the space occupied by the bending portion 130 , increasing the space utilization of the battery cell, and improving the energy density of the battery cell.
  • the space occupied by the stacked adapter can be reduced, the space utilization of the battery cell can be increased, and the energy density of the battery cell can be improved.
  • a minimum thickness of the bending portion 130 of the first adapter 90 may be smaller than that of the non-bending portion.
  • the minimum thickness of the bending portion 130 of the first adapter 90 may be smaller than a minimum thickness of either one of the first non-bending portion 91 and the second non-bending portion 92 , or the minimum thickness of the bending portion 130 of the first adapter 90 may be smaller than a minimum thickness of the first non-bending portion 91 or a minimum thickness of the second non-bending portion 92 .
  • a minimum thickness of the bending portion 130 of the second adapter 100 may be smaller than that of the non-bending portion.
  • the minimum thickness of the bending portion 130 of the second adapter 100 may be smaller than a minimum thickness of any one of the third non-bending portion 110 , the fourth non-bending portion 140 , and the fifth non-bending portion 120 .
  • the bending portion 130 may include a transition section 131 and a middle section 132 , where two ends of the middle section 132 each are connected to one transition section 131 , the transition section 131 is connected to the non-bending portion, and thickness of the transition section 131 decreases in a direction leaving the non-banding portion connected to the transition section 131 ; and the bending portion 130 and the non-bending portion connected to the bending portion 130 are connected in a smooth transition.
  • This can reduce stress at a joint between the bending portion 130 and the non-bending portion connected to the bending portion 130 , thereby reducing the possibility of fracture of the first adapter 90 and the second adapter 100 .
  • the bending portion 130 and the non-bending portion may be made into an integral structure; or certainly, the bending portion 130 and the non-bending portion as separate structures may be connected, for example, by welding, which is not specifically limited herein.
  • part a of FIG. 15 is a schematic diagram of the second adapter 100 being laser-welded to the second tab 62
  • part b of FIG. 15 is a schematic diagram of the second adapter 100 obtained after secondary bending
  • part c of FIG. 15 is a schematic diagram of the first adapter 90 being laser-welded to the first tab 61
  • part d of FIG. 15 is a schematic diagram of the first adapter 90 and the second adapter 100 after being bent and put into a housing.
  • a process of putting the first adapter 90 and the second adapter 100 into the housing may include the following steps:
  • the second adapter 100 and the electrode assembly 60 do not need to be flipped during battery assembling, implementing easy assembling; and the first adapter 90 and the electrode assembly 60 need to be bent only once during battery assembling, so that a welding position on the electrode assembly 60 can be accurately determined, facilitating placement into the housing.
  • resistivity of the second adapter 100 is smaller than that of the first adapter 90 , to reduce a resistance difference between the two adapters, so that heat generated by the first adapter 90 is close to that generated by the second adapter 100 , thereby improving consistency of the battery cell 40 .
  • the first adapter 90 is a positive adapter
  • the second adapter 100 is a negative adapter.
  • the first adapter 90 is made of aluminum
  • the second adapter 100 is made of copper.
  • the resistivity of the positive adapter is greater than that of the negative adapter. Compared with a positive adapter of the same specification, a negative adapter generates more heat, leading to problems in the positive and negative adapters, such as uneven temperature distribution and excessive local temperature rise.
  • length of the second adapter 100 is designed to be greater than that of the first adapter 90 to achieve more balanced heat distribution for the positive and negative adapters.
  • the length of the negative adapter can be set to be greater than that of the positive adapter.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)
US17/973,741 2020-12-21 2022-10-26 Battery cell, battery, and electric apparatus Pending US20230049457A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN202011518512.9 2020-12-21
CN202011518512.9A CN114649556A (zh) 2020-12-21 2020-12-21 电池单体、电池以及用电装置
PCT/CN2021/132201 WO2022134985A1 (fr) 2020-12-21 2021-11-22 Élément de batterie, batterie et appareil électrique

Related Parent Applications (1)

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EP (1) EP4148897A4 (fr)
JP (1) JP2023525553A (fr)
KR (1) KR20220166343A (fr)
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WO2024026861A1 (fr) * 2022-08-05 2024-02-08 宁德时代新能源科技股份有限公司 Élément adaptateur, élément de batterie, batterie et dispositif électrique
CN115548346B (zh) * 2022-09-23 2024-02-20 厦门海辰储能科技股份有限公司 集流组件及电池

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KR100675700B1 (ko) * 1999-08-10 2007-02-01 산요덴키가부시키가이샤 비수 전해액 이차 전지 및 그 제조 방법
KR20060097603A (ko) * 2005-03-09 2006-09-14 산요덴키가부시키가이샤 전지 및 그 제조 방법
JP2012160282A (ja) * 2011-01-31 2012-08-23 Hitachi Vehicle Energy Ltd 円筒形二次電池
CN206332097U (zh) * 2016-11-23 2017-07-14 东莞新能源科技有限公司 一种二次电池电芯
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CN209658320U (zh) * 2019-05-24 2019-11-19 宁德时代新能源科技股份有限公司 电池单元及电池模组
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EP4148897A4 (fr) 2024-03-13
JP2023525553A (ja) 2023-06-16
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EP4148897A1 (fr) 2023-03-15
WO2022134985A1 (fr) 2022-06-30

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